Steam-boiler and fu



(No Model.)

W. s. POST & H. DE WOLF SAWYER. STEAM BOILER AND FURNACE.

.No. 299,578 Patented June 3, 1884:

.3 2 P1 W\\c\e,sse, I \w emhm w UNITED STATES PATENT Urrrcs.

WILLIAMS. POST, OF BOSTON, AND HOXVARD DE XVOLF SAVYER, OF RE- VERE,MASSACHUSETTS.

STEAM-BOILER AND FURNACE.

SPECIFICATION forming part of Letters Patent No. 299,578, dated June 3,1884.

Application filed September 7, 1883. (No model.)

T a whom it may concern Be it known that we, WILLIAM. S. Posr and HOWARDDE WOLF SAWYER, citizens of the United States, residing, respectively,in Bos- 5 ton and Revere, Suffolk county, Massachusetts,

and illustrated in the accompanying drawings.

This improvement relates to furnaces, locomotive and stationary boilers,and apparatus generally for the conversion of water into steam.

l 5 Ourinvention consists in new combinations of devices, as recited inthe appended claims, whereby under an improved arrangement of drafts andwater-legs the highest attainable intensity of heat is secured and theheat utilized to the utmost.

A general idea of our principal improvement will be gathered from thedrawings and from the statement that the body of incandescent fuel restsupon the slightly-inclined upper sur- 2 5 face of a water-leg, and alsoupon an oblique water-grate, and that over and through this fuel alateral and indirect downward draft is maintained through said grate,and against otherwater-legs and surfaces standing transo versely to thecaloric current, that it may inipinge upon them and speedily convertinto steam the water contained therein.

In the drawings, Figure 1 is a vertical lon gitudinal section of aboiler containing the several features of our invention, and Fig. 2

is an end view thereof.

A is the firebox, and B the ash-box, separated by the inclined hearth orwater-leg O and water-grate D, which together support 40 the fuel E, asindicated in Fig. 1. The tubes of the grate D extend obliquely and sideby side from the front edge of the water-leg O to the side of anotherone, F, running down obliquely from the top of the fire-box to the grateD, and afterward extending vertically nearly to the bottom of theash-box. From this ver tical portion another water-leg, G, extendsobliquely below and about parallel with the grate, serving to divide theash-box into two irregular-shaped chambers, about as shown.

The walls which inclose the fire-box and aslr box are hollow,constituting water-spaces H on all sides and at the bottom .thereof, thewa ter communicating with such spaces at each side or end of the severalwater-legs and with the general supply in the boiler, continuously fedby a suitable inlet-pipe, as required. The darts denote the arrangementof draft and direction of the caloric current, peculiar to ourinvention. The supply of air which supports combustion enters thefirebox through the grated doorI, and flows first laterally over thatpart of the fuel which rests on the water-leg G, then through theoblique grate D and the fuel resting thereon, by which the gases andlight unconsumed portions of combustible material are burned andutilized as fuel. The current is then deflected downwardly andrearwardly by the water-legs F and Gyupon which it impinges, and applieswith great effect upon them and beneath the leg 0, as well as againstthe water-spaces forming the walls and bottom of the ash-box. Passingthe extremity of the leg G, the current again impinges on the lower endof the leg F, and is deflected against the under side of G, and passesupwardly through the flue K into a chamber, L, whence it enters thehorizontal tubes M of the cylindrical part of the boiler, if such partis provided, and escapes through the stack or funnel.

\Vhen our invention is applied to locomotive'boilers, we provide anair-inlet, N, at the front of the ash-box, and a passage, N, leadingthence to the draft-grate 1. Rapid forward motion thus greatlystrengthens the draft. Suitable dampers, a, may be provided to close thedraft when desired. The grate I is provided with a door, J, which may beclosed to terminate the air-passage N and deflect the air into thefire-box; orit may be opened to bank or draw the fire. The grate Iis, asshown, made in two parts, the upper part rigid and the lower turning ona pivot, that it may be turned down to give access to the fuel, whichmay be supplied through the opening so formed or through a separatedoor, 0, above it.

In starting the fire no direct draft is necessary,since the fuel isfirst placed, mainly, on the water-leg O, and the oblique water-grate Dis but thinly cover ed, the smoke passing through it and along the usualpath of the current, as described. W'hen thoroughly ignited, the fuel ispiled upon the grate D and a fresh supply furnished from time to time,the gases being consumed in passing through the grate and fire thereon,as stated.

\Ve claim as our invention 1. In a steam-boiler or furnace, the fire-boxhaving an oblique depending water-leg, forming a deflecting-wallopposite the feed-door, in combination with the hearth U and watergrateD, extending obliquely from the hearth to said water-leg, substantiallyas and for the purposes set forth.

2. In a steam-boiler or furnace, the oblique watengrate D, incombination with the waterlegs 0 l G, substantially as and for thepurposes set forth.

3. Thewater-spaces II, forming walls for the firebox and ash-box, andthe water-legs F G, communicating therewith, in combination with thehollow hearth C and grate 1), serving together to support the fuel andpromote a lat eral and oblique draft through it, for the purpose sctforth.

4-. In asteam-boiler or furnace, the combination of the fire-box A, thedoor J, and the vertical and separable grate Lloeated below thefeed-door, and forming a lateral support and guard for the fuel,substantially as set forth.

5. lhe fire-box and the ash-box, separated from each other by theoblique watenhearth G and grate D, in combination with the flue K andits terminal enlargement L, separated from the aslrbox and fire-box bythe unperforated water-leg 1 extending below the grate nearly to thebottom of the ash-box, whereby the calorie current is at all timesindirect, substantially as set forth.

In testimony whereof we hereto affix our signatures in presence of twowitnesses.

\VILLIAM S. POST. IIOXVA'RD DE \VOL'F SAWYER.

\Vitnesses:

A. II. Sr'nxenn, 10. A. lnuLrs.

